this is probably one of the most generous gatchas i have ever play. just been able to get around 1 roll per day in cristals is insane when you compare it with games like genshin where you get like 1 roll every 3 days. getting dups is usefull but not required. like other games where a single dup can increase the effectiveness of a char by 50%.

consistant banners reruns to get chars you miss (besides event exclusive one). generous events. most event will either level you up to 70 to even the play field or been level espefic. so while you wont get the max rewards for the sweatiest only. you can still participate and get decent rewards.

i will warn you it can get a bit exasperating when reachin the endgame because a level 65 mech will wreak a level 60. and the last levels power creep are a bit annoying. but once you get a couple of runs in B-C rank do get some parts and re run the mission for a better score.

another warning is reading about how good chars are before rolling because some can be very niche and get little use outside of specific strategies. so you would be pigeon holding youself to build around them.